/***********************************************************************
 * BinTrotter : BitTorrent library/client for the Android operating system.
 *  
 * Copyright (C) 2009, Christopher David Stones (chris.stones@gmail.com)
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 ***********************************************************************/

package org.bintrotter.bdecode;

import java.util.Arrays;


public class TreeUtils {

	public static Node<BCodeTree.NodeData> getListItem(Node<BCodeTree.NodeData> list, int item) {
		
		Node<BCodeTree.NodeData> itemNode = list.child;
		
		while((item--) > 0)
			itemNode = itemNode.sibling;

		return itemNode;
	}
	
	public static Node<BCodeTree.NodeData> lookupInDictionary(Node<BCodeTree.NodeData> dict, String key) {
		
		byte[] keyBytes = key.getBytes();
		Node<BCodeTree.NodeData> keyNode = dict.child;
		
		while(keyNode != null) {
			if(Arrays.equals(keyBytes, keyNode.data.getString()))
				return keyNode.sibling;
			
			keyNode = keyNode.sibling.sibling;
		}
		return null;
	}
	
}
